![We have a tankless water heater. Water gets & stays hot everywhere else. However, this tub faucet starts to get hot but within 30 seconds goes cold. Taken baths before & never We have a tankless water heater. Water gets & stays hot everywhere else. However, this tub faucet starts to get hot but within 30 seconds goes cold. Taken baths before & never](https://external-preview.redd.it/we-have-a-tankless-water-heater-water-gets-stays-hot-v0-FUbs99ykCd07KZMtTn4XWShnICPwb7W-3kQhUFKQwCg.jpg?width=640&crop=smart&auto=webp&s=6041130b1df1d7bb67875e5bcf7e5487d59c2959)
We have a tankless water heater. Water gets & stays hot everywhere else. However, this tub faucet starts to get hot but within 30 seconds goes cold. Taken baths before & never
![Feeling stupid, my tankless water heater turns cold when I'm in the shower | Terry Love Plumbing Advice & Remodel DIY & Professional Forum Feeling stupid, my tankless water heater turns cold when I'm in the shower | Terry Love Plumbing Advice & Remodel DIY & Professional Forum](https://terrylove.com/images/pic/navien-filter-1.jpg)
Feeling stupid, my tankless water heater turns cold when I'm in the shower | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
![A bath can be filled by the cold water pipe in 10 minutes and by the hot water pipe in 15 m - YouTube A bath can be filled by the cold water pipe in 10 minutes and by the hot water pipe in 15 m - YouTube](https://i.ytimg.com/vi/SAPXQdgYnsM/maxresdefault.jpg)